Half to hitfus ii



'present instance I have shownthls block 01' Fignre 1 is a side elevation of-a plurality or se rie's of my improved bed s platcs, 01 blocks .seo in a common support. Fig."2 is an enlargcd perspective view cf one cf tl1e blocks, becls', 01 plates. Fig. 3 is a substantially cen-' tral vertical scctio'n through the same with thecutter an d the material 120 be acted upon the'reby indicatecl by dott-ed lines. Fig. 4 is a perspectiVcclctzl of one 0f the blocks"of rawhide.

Like letters cf refcrcnce incliczte lik parts throughout the several views. A

Referring now 130 the details cf the d'rawi*ngs by letter, A designates thc bed, plate, 01 block, which isof a material which Will expand by heat evolved by the cutting-tool, and for this purpose I prcfef '00 employ rawhide, which 1nay bc in a single block, as inclicaed in Fig. 4, 01 cf a plurality of disks 01 plugs, as indicated by dotte d lines in Fig3. In the bed, whether -composed of a singl'e piece or of a plurality of picces 0r disks, as confined within 01 encompasscl by a jackct 01 a socket B, which nlay be supported in 'posim'on in zu1y suitable mannev, aus, for instance, in a becl, platze, or Support O, as shown in Fig. 1, wherc are illustrated a plurality cf my improvcd beds, platcs, orblocks. A suitable provision maybe mad e for adj ustment t0 compensatc for weavr;which, however, by t1l'1e "mploymcnt cf 1;l1e rawhide is very small compared with that when leather, wood, orlead is employcd. In this instance I have shown a screw .D as the nieans for accomplishing tl1is cnd. 'lhis Screw is adapted to'engagc ehe intcrnallythreaded exfiension B of tl1e socket, in which the rawhide O! 0Lher material is conflncd, and

this scr ew is provided yvith a l'1cad D, lmving suitable prm*islon fo'r the engagcmcnt 01 recepion of a suitablc tool by which lt maybe th material supported'upon thc die block,

turned 110 adjust the block A outwm-d. Thc

uppcr engl of this screw bears against an l.

forms a rest or bcaring f01 the block 01 be(l A, as seen besh in Fig. 3. A11 thc junctlon of the sockpt and the extcnsion there are provided thc sho'ulders b which scrve 110 rast upon thc top of the bed, plate, or' support C, whilc the tubular extension passes therethrough, and thus the stmin andpressure arc bornc by thc shouldcrs and betl, plate, 01' s-upgcrb.

In Fig. 3, E desi 'gnates the cutter, and F bed, or plate, and the tool is shown as having pssecl through su'ch material and its shal"p cdge imbedded in the block A.

I have found out by cxperimcnt that rawhide when confined so thab it cannot swcll 0b enlmge that the blow or blows cf tshe pc'r'cussi0n-cutter prodnce hcat, and the heat thns.

produced has a tendancy to eause the rawhidc 110 swcll, but tl1e confinemeno thcreof prcvents it's swelling, and. thercfore the hea-t caused by tl1e blows in rapid succession,

Which, werc the rawhide unconfined, would causc it.to swcll, causcs tl1e cut madc therein by the cuttcr t0 close as fast as ib is cut 0pen. This action is dissimilar t0 the springing back -of a matcrial like rnbber, bat; closely resembles the expansion and contractionbyheat in metal. Thus thc life Of thc block is very matcriall y lcngthened, an ll mucl1 better work is pr oduccd, as I am enabled t0 use a sharp cuter, thc point or cnttin'g eclge n0t being dulljed by its contact with thc rawhidc Repeated blows in thc same placc Will not produce and leavc an opening, as in wood 01 leather.

Modifications in detail may be resorted to without departing from tl1e spirit 0f. ohe invcntion or sacrificing any of its advantagesfl \Vhat I claim as new is- 1. As an improvcd arti'cle cf manufacture for usc in a, machine cmploying a punc h and a punch-block, tl1e combination of a hollow post supportcd by a bcd, an adjust ing-screw threaded into the post, an d a punch-block',

dropp'?llnto the hollow of tahc posl; and seat upon the end of tl1c;adjustingscreW; all substantially as and forol1e purpose specified.

2. As an improvcd article 0f manufacture for use in a machine cmploying a punch in a punch-block, the combination of ahollow post suppo'rtcd by a bed, a'n a'djusting screw threaded into thc post, and a punch-block composed cf a, plurality 01: disks cf rawhide arranged in the hollow cf the post and seated uponthe end of the adjusting-screw whereb y they are cntirely encompassed by the' metal 0f nhc post; substantially as and for ehe purposc specified. 1

3. As an improved article cf manufacture,

IOC

the combinauiori-of al 1ollow post independenfi Iio 

